QC Firefox bug fix

Fixed the issue where all the textboxes, dropdowns ont he QC page were disabled in Firefox. Turned out to be due to a bug in JQuery sortable where disabling sortable on the container div also disabled the contained input elements. Implemented a workaround which involved overriding sortable's mouse events
Merge branch 'master' of github.com:MarkVSullivan/SobekCM-Web-Application